Smoke-preventer



(No Model.) 3 Sheets-Sheet 2.

0. SMITH.

SMOKE PREVENTER. Y No. 535,740. Patented Mar. 12, 1895.

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3 Sheets-Sheet 3.

Patentd M31212, 1895..

NlTED STATES PATENT OFFICF.

CHARLES SMITH, OF ST. LOUIS, MISSOURI.

SMOKE-PREVENTER.

SPECIFICATION forming part of Letters Patent No. 535,740, dated March 12, 1895.

Application filed September 26, 1894:. Serial No. 524,182- (No model.)

1' 0 aZZ whom it may concern.-

Be it known that I, CHARLES SMITH, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented a new and useful Improvement in Smoke- Preventers, of which the following is a specification.

It is well known that dense volumes of smoke once generated can not for practical purposes be ignited and consumed. The formation of thissmoke must, therefore, be prevented by employing means that will effect a more perfect combustion. Hence the ob ject of my invention is to provide an improved device to be used in connection with boilers and other furnaces, by which a more perfect combustion is accomplished than is possible under ordinary circumstances, thereby preventing the formation of smoke.

My invention is an improvement on the device for which Letters Patent No. 480,630 were granted to me August 9, 1892. In this device smoke was prevented by means of atmospheric air being introduced into the com bustion chamber of the furnace through a valvedoor, and met by steam introduced through an ordinary j et placed above the door; the amounts of air and steam being regulated in a manner proper to secure the best results.

My present invention relates to an im-' proved form of construction and combination of the parts which comprise the furnace door, and an improved form of construction of the steam jet combined therewith.

Referring to the accompanying drawings, which form a part of this specification and which illustrate the best form of said improvements, Figure 1 is an elevation of the front of the boiler and furnace. Fig. 2 is a detail vertical longitudinal section of Fig. 1 through the line 2. 2. Fig. 3 is a front elevation of the furnace door. Fig. at is a top view of the door and frame, part in section, along the line 4.4.. of Fig. 3. Figs. 5 and 6 are verticalsections of the furnace door along the line 5. 5. of Fig. 3. Fig. 7 "is ahorizontal section of the discharge end of the steam jet device. Fig. 8 shows the jet in perspective. Fig. 9 shows the same view of the boiler as Fig. 2 only it is a full front while Fig. 2 shows a half front. Fig. 10 is a horizontal longitudinal section of Fig. 9 along the line 6. 6.

Similar parts are designated by the same letters throughout the several drawings.

A represents the boiler; A, the firebox; A the grate bars; A the ash pit; A, the inclos; ing wall; A the ash pit door; B, the furnace door; 0, an extension box frame supporting the door B; D, an adjustable deflecting plate placed in the door frame B; E, a lever to control the position of D; F, an inner frame fastened to the door B by bolts b. b. and supporting by hinges a. mthe deflecting plate D.

The furnace door or all that is hung on the hinge 9 may in case of afull front boiler (Fig. 9) be' placed flush with the masonry; but on a half front boiler (Fig. 2) the door is hung on an extension boxO (Figs. 2, 5 and 6) constructed to project out from the masonry sufficiently far to keep the plate D removed from the fire when raised, (Figs. 2 and 6.) This extension frame 0 accomplishes an es sential feature in that it heats the air before it enters the fire box, and thereby prevents loss of fuel, which would otherwise occur. Another essential feature of this part of my invention is that this form of construction places the door far enough away to prevent coals from falling on the deflecting plate and thereby stopping the free admission of air.

To the door frame B is fastened by bolts bl). aninner frame F having a straight lower edge. The advantage of this improvjementis "that the inner frame F furnishes a straight lower edge to which to hinge the deflecting plate D, whereas the frame B being usually made with a curved top a proper direct attachment of said deflecting plate D to the door frame is impossible. This plate D opens inwardly and fits closely within the inclosing frame. It has numerous perforations c. c. 0., and is hung on frame F by hinges a. 0b. The said perforations serve to keep the plate cool and prevent its warping as it otherwise would. This plate when closed is constructed to hang slightly out of the vertical (Fig. 5). It is opened for the admission of air and locked in any desired position by means of aleverE, said lever being notched on its lower edge so as to hold the plateD at various angles. The form of lever E is curved as shown (Figs. 5 and 6) so as always to stand snug with the door frame, and it works against and is held in position by a guard (1. cl. attached to the said door frame. The essential element of this form of construction is that the lever working snug with the door does not project out and strike the furnace front when the door is open nor does it stand in the way when the door is closed. It and the door are prevented from striking the furnace front by the door stop h (Fig, 4) which allows the door to open only to the desired degree.

The steam jet device is placed through the masonry directly above the furnace door, its discharge end being three or four inches lower than the outer end. It is inserted in a somewhat larger covering tube 6 (Fig, 5) loosely enough to allow it to be withdrawn when necessary to clean. The jet itself (Figs. 7 and 8) has firmly Welded into it for a distance of from one-half to one and one-half inchesa solid plugj which has drilled through it"int.o the tube proper two or more holes at an angle about as indicated in the drawings. By this means the steam is thrown into the combustion chamber in a horizontal fan shaped spray (Fig. 10.)

The holes are drilled through the welded plug in a manner to throw the steam exactly where desired, keeping the air down uniformly over the fire. The number of holes,

their position and direction are governed by the size and peculiarities of the boiler. The downward dip at which the jet is placed enables the steam to meet the air entering under the deflecting plate, which air is spread over the fuel and kept there by the sheet of steam, thus furnishing oxygen for thecomplete combustion of all the fuel, thereby preventing the formation of smoke.

What I claim as new in the improved ole-.- vice herein described, and desire to secure by Letters Patent, is-

In a smoke preventer, the combination of a furnace door provided with an opening therein; .an inner frame attached to the said door above and inside of the opening, said inner frame having a straight lower edge; a perforated deflecting plate hinged to said inner frame, said deflecting plate being controlled by a lever; a steam jet device consisting of a tube having a plug firmly welded into its discharge end, through which are drilled horizontally two or more holes, and an outer inclosing tube somewhat shorter than the jet, substantially as and for the purposes set forth.

CHARLES SMITH. Witnesses:

STANLEY SToNER, CHAS. R. MORRISON. 

